Attempt This Online

Attempt This Online is an online sandbox environment for running code in an ever-growing list of programming languages, both practical and recreational. ATO was originally conceived as a replacement for the increasingly out-of-date Try It Online service.

To get started, click the button below to run some code.

Run

By using this website, you agree to be bound by our Privacy Policy and Terms of Use.

Why ATO?

• It's completely free of charge
• The software is open-source (available under the copyleft GNU Affero General Public License 3.0)
• We don't advertise or use any tracking technologies
• Regularly maintained: new languages and features are added by request all the time
• The interface is customisable (see the Preferences page)

Give Feedback

If you have a feature suggestion, bug report, or request for a new or updated language, open an issue in the GitHub repository. Feel free to implement it yourself and submit a pull request!

You can also discuss ATO in the dedicated Stack Exchange chatroom.

Support

I currently pay for ATO entirely myself (see the finances spreadsheet). Your support using any the following methods will be greatly appreciated.

• Make a one-time or recurring-monthly donation via GitHub Sponsors
• ATO runs on cloud servers from Hetzner. Sign up using my referral link to get €20 free credit. If you spend €10 (excluding the free credit), I'll get €10 credit to cover ATO's costs.